For the DCM feedback, we don't care about the phase of this clock
relative to anything else, but we do need a feedback. I think you can
just wire CLK0 directly to CLKFB.
I'll find some docs about what this feedback is all about. But a wire
connecting CLK0 to CLKFB will do the trick?
Actually to use the ClkFx output with a frequency input below 18MHz
there shouldn't be any feedback present on the dcm.
For the documentation it's in the document ds099.pdf page 88 table 59
for the timing specification for the Digital Frequency synthesizer.
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